| Description |
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A buffer underflow issue has been found in the php-fpm component of php before 7.3.11, leading to remote code execution in certain nginx + php-fpm configurations. |
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A buffer underflow issue has been found in the php-fpm component of php before 7.3.11 and 7.2.24, leading to remote code execution in certain nginx + php-fpm configurations. This vulnerability can be exploited if the fastcgi_split_path_info directive contains a regexp that can be broken by an attacker by supplying %0a in the path info which results in the fastcgi_param PATH_INFO being empty. |
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| References |
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https://bugs.php.net/bug.php?id=78599 |
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https://git.php.net/?p=php-src.git;a=commitdiff;h=19e17d3807e6cc0b1ba9443ec5facbd33a61f8fe |
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https://github.com/neex/phuip-fpizdam |
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| Notes |
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Workaround: |
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If nginx and php-fpm share the same filesystem, one can first check the script actually exists, so the malicious request will never make it to php-fpm (it is usually done using something like `try_files $uri =404`). Or there may be cgi.fix_pathinfo=0 which will also prevent exploitation. |
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